小学英语语法汇总（四）
Do 的四作用
动词do在句中的作用可以概述为四句十二字："做"实义，助动词，替前文，强语气。
作用一：实义do
do作实义动词时，有do, does, did, done, doing五种形式，还有及物、不及物之分。如：
1. vt. "做；研究；整理；完成"。如：
①The old man does an hour of sport every day.
②She did her homework at home last night.
③Mother was doing the cooking when I reached home.
④Have you done the exercises yet?
